Effects of Fluid Chemistry on Precipitation Kinetics of Calcite and Dolomite at Subsurface Temperatures (100-300 C) and Pressures (300-1000 atm)

拟议的项目将研究方解石和白云石在100至300摄氏度和相应的静水压力(约300至1000大气压)下的沉淀动力学。该项目将为理解碳酸盐岩的埋藏成岩作用和热液蚀变作用做出重大贡献，因为它将为方解石和白云石在高温高压下的沉淀速率(以及方解石的白云岩化作用)提供一个系统的数据库。1)改进将用于实验的高温高压连续流动搅拌反应器系统；2)进行初步实验，以确定给定沉淀率下的流量、初始流体的化学成分和种子质量的最佳组合；3)收集关于每个流体参数的动力学效应大小的初步数据。

The proposed project will investigate the kinetics of calcite and dolomite precipitation at temperatures between 100 and 300oC and corresponding hydrostatic pressures (about 300 to 1000 atm). This project will be a significant contribution to understanding burial diagenesis and hydrothermal alteration of carbonate rocks because it will provide a systematic database for rates of calcite and dolomite precipitation (and dolomitization of calcite) at high temperatures and pressures. A planning grant is necessary to 1) refine the high temperature and pressure continuous-flow-stirred reactor system which will be used for the experiments; 2) conduct preliminary experiments to determine the optimal combinations of flow rate, chemical compositions of initial fluids, and seed masses for a given precipitation rate; 3) collect preliminary data on the magnitude of kinetic effects of each fluid parameter.